Gage and alarm for steam-boilers.



No. 738,958.. l PATENTED. SEPT. 1903.

Tfmmsau. GAGE Arm ALARM Ffm. STEAMBOILERS.

ALEEMQLTENI FIBRE DBO. 22. 1902.

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In Va n Zar UNITED STATES Patented September 15, 1903.

PATENT OEEICE.

GAGE AND ALARM FOR STEAM-BOILERS.

SPECIFICATION forming part of `Letters Patent No. 738,958, datedSeptember 15, 1903.

Application iiled December 22, 1902. Serial No. 12B-6,256. (No model.)

.To @ZZ whom it may concern:

Be it known that I, EENEs'r THOMPSON, a subject of the King of GreatBritain and Ireland, and a resident of 40 Hardman street, Hollinwood,near Oldham,vin the county of Lancashire, England, have invented anImproved Gage and Alarm for Steam-Boilers, of which the following is aspecification.

This invention relates to a gage and alarm for use with steam-boilers,and is intended to indicate by 'electrical means when the water in theboiler falls or rises below or above the proper levels.

The gage is of the ordinary, steam-gage pattern, marked in inches andparts of an inch, and upon the dial is placed an electrical contact insuch a position that when the nger or pointer reaches either end thewater is at maximum or minimum level. nections are made to a bell orother suitable indicator, which may be in any position, so that theperson in charge is at once warned that somethingis wrong. The hand orpointer is operated by a sprocket-wheel and Ychain carrying a float andcounterpoise, the iioat rising or falling with the water-level.

In order that this invention may be more readily understood, referenceis had to the accompanying sheet of drawings, in which- Figure 1 is afront view of my improved indicator and alarm, and Fig. 2 is a sectionshowing both outside and inside parts.

A is the casing of the gage, having the ordinary .cover a, through whichthe indicator is seen.

B is the dial-plate, and upon the face of this is fixed a ringconsisting of the metal part O and a vulcanite or other non-conductingpart C,the dial being graduated in inches, as shown. In the apparatusillustrated the metal contact-ring extends throughout the greater partof the circle,the vulcanite portion reaching only from four andOne-haii:` inches to ten inches.

The pointer or hand D is carried upon the spindle E, which tits closelyin the metal sleeve F, secured by the screwed nuts f in the face of theboiler-casing G, the sleeve and spindle projecting some distanceWithinthe boiler. The spindle E is formed with the collar e, and the nute' presses it against its Electrical con-v seating in the sleeve F,forming a steam-tight 'oint.

J On the inner end ofthe spindle E is the sprocket-wheel H, and overthis passes the chain h, carrying the float h', and having at its otherend a counterpoise h2, which keeps the chain taut, this being shown indotted lines in Fig. 2.

The gage-casing is provided with the terminals J and J', the terminal Jbeing in electrical connection with the pointer D through the casing andspindle and the terminal J' being insulated from the casing Yandconnected to the contact-ring C through the screw-pin c, which passesthrough the dialplate B and also acts as a stop for the pointer D whenat its extreme position.

The terminals J and J are electrically connected to any suitable form ofalarm, such as the ball K, and to the battery K', (showndiagrammatically in Fig. 1,) and it will be seen that when the pointer,the end of which always bears upon'the ring, falls below four andonehalf inches or rises above ten inches, according to the arrangementshown in Fig. l, an alarm'is givenindicating that the water has reacheda dangerous level. The position of the pointer of course depends uponthe level of the float h Within the boiler, the sprocketwheel H turningas the iioat rises or falls.

What I claim as my invention, and desire to secure by Letters PatentisThe improved gage and alarm for steamboilers, having a dial-plate Bwithin acasing,

a circular contact C upon the dial, a long spindle E carrying thepointer, a sleeve F supporting the spindle E, the collar e on thespindle bearing against a seating in thesleeve and forming a steam-tightjoint, a sprocket-wheel H upon the inner end of the spindle, a chain hhaving loat h and counterpoise h2 supported upon the sprocket-wheel andelectrical connections from a battery and alarm to the pointer Dand'contact-piece C, substantially as herein described and shown. Inwitness whereof I have hereunto set my hand in the presence of twowitnesses.

ERNEST THOMPSON. Witnesses:

ARNOLD RILEY, PETER THOMPSON.

